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https://www.readbyqxmd.com/read/28922646/synthesis-spectral-characterization-and-computed-optical-analysis-of-potent-triazole-based-compounds
#1
Sajjad H Sumrra, Fazila Mushtaq, Muhammad Khalid, Muhammad Asam Raza, Muhammad Faizan Nazar, Bakhat Ali, Ataualpa A C Braga
Biologically active triazole Schiff base ligand (L) and metal complexes [Fe(II), Co(II), Ni(II), Cu(II) and Zn(II)] are reported herein. The ligand acted as tridentate and coordinated towards metallic ions via azomethine-N, triazolic-N moiety and deprotonated-O of phenyl substituents in an octahedral manner. These compounds were characterized by physical, spectral and analytical analysis. The synthesized ligand and metal complexes were screened for antibacterial pathogens against Chromohalobacter salexigens, Chromohalobacter israelensi, Halomonas halofila and Halomonas salina, antifungal bioassay against Aspergillus niger and Aspergellus flavin, antioxidant (DPPH, phosphomolybdate) and also for enzyme inhibition [butyrylcholinesterase (BChE) and acetylcholinesterase (AChE)] studies...
September 13, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28922603/semiconductor-plasmon-induced-upconversion-enhancement-in-mcu2-xs-sio2-y2o3-yb-3-er-3-core-shell-nanocomposites
#2
Donglei Zhou, Dongyu Li, Xiangyu Zhou, Wen Xu, Xu Chen, Dali Liu, Yongsheng Zhu, Hongwei Song
The ability to modulate the intensity of electromagnetic field by semiconductor plasmon nanoparticles is becoming attractive owing to its unique doping induced local surface plasmon resonance (LSPR) effect different from metals. Herein, we synthesized the mCu2-xS@SiO2@Y2O3:Yb(3+),Er(3+) core-shell composites and experimentally and theoretically studied the semiconductor plasmon induced upconversion (UC) enhancement, and obtained 30 folds UC enhancement compared to that of SiO2@Y2O3:Yb(3+),Er(3+) composites...
September 18, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28921693/liquid-cell-electron-microscopy-of-adsorbed-polymers
#3
Kandula Hima Nagamanasa, Huan Wang, Steve Granick
Individual macromolecules of polystyrene sulfonate and poly(ethylene oxide) are visualized with nanometer resolution using transmission electron microscopy (TEM) imaging of aqueous solutions with and without added salt, trapped in liquid pockets between creased graphene sheets. Successful imaging with 0.3 s per frame is enabled by the sluggish mobility of the adsorbed molecules. This study finds, validating others, that an advantage of this graphene liquid-cell approach is apparently to retard sample degradation from incident electrons, in addition to minimizing background scattering because graphene windows are atomically thin...
September 18, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28921378/chemistry-and-chemical-equilibrium-dynamics-of-bmaa-and-its-carbamate-adducts
#4
Pedro Diaz-Parga, Joy J Goto, V V Krishnan
Beta-N-methylamino-L-alanine (BMAA) has been demonstrated to contribute to the onset of the ALS/Parkinsonism-dementia complex (ALS/PDC) and is implicated in the progression of other neurodegenerative diseases. While the role of BMAA in these diseases is still debated, one of the suggested mechanisms involves the activation of excitatory glutamate receptors. In particular, the excitatory effects of BMAA are shown to be dependent on the presence of bicarbonate ions, which in turn forms carbamate adducts in physiological conditions...
September 18, 2017: Neurotoxicity Research
https://www.readbyqxmd.com/read/28920693/ph-tunable-and-divalent-metal-ion-tolerant-polymer-lipid-nanodiscs
#5
Thirupathi Ravula, Nathaniel Hardin, Sudheer Ramadugu, Ayyalusamy Ramamoorthy
The development and applications of detergent-free membrane mimetics have been the focus for the high-resolution structural and functional studies on membrane proteins. The introduction of lipid nanodiscs has attracted new attention towards the structural biology of membrane proteins and also enabled biomedical applications. Lipid nanodiscs provide a native lipid bilayer environment similar to the cell membrane surrounded by a belt made up of proteins or peptides. Recent studies have shown that the hydrolyzed form of styrene maleic anhydride copolymer (SMA) has the ability to form lipid nanodiscs and has several advantages over protein or peptide based nanodiscs...
September 18, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28920672/assembling-hollow-cobalt-sulfide-nanocages-array-on-graphene-like-manganese-dioxide-nanosheets-for-superior-electrochemical-capacitors
#6
Hao Chen, Min Qiang Wang, Yanan Yu, Heng Liu, Shi-Yu Lu, Shu-Juan Bao, Maowen Xu
Metal-origanic frameworks (MOF)-derived hollow cobalt sulfides have attracted extensive attention due to their porous shell that provides rich redox reactions for energy storage. However, their ultra-dispersed structure and large size of MOFs precursors result in relatively low conductivity, stability, and low tap density .Therefore, the construction of an array of continuous hollow cages and tailor the inner cavity of MOF-derived materials is very effective for enhancing the electrochemical performance. Herein, we in situ assembled small Co-based zeolitic imidazolate framework (ZIF-67) on the both sides of negatively charged MnO2 nanosheets to fabricate a hierarchical sandwich-type composite with hollow cobalt sulfide nanocages/graphene-like MnO2...
September 18, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28920670/fabrication-of-hierarchical-porous-carbon-nanoflakes-for-high-performance-supercapacitors
#7
Yamin Yao, Yunqiang Zhang, Li Li, Shulan Wang, Shi Xue Dou, Xuan Liu
In the current work, the carbon nanoflakes (CNs-Fe/KOH) and porous carbon (PC-Ni/KOH) have been produced by using Fe(NO3)3/KOH and Ni(NO3)2/KOH as the co-graphitization/activation catalysts to treat the natural plane tree fluff, respectively. The as-prepared carbon materials show different morphologies when treated with different metal ions. Compared with PC-Ni/KOH, the CNs-Fe/KOH have both high graphitization degree (IG/ID = 1.53) and large SBET (1416 m2/g). In a three-electrode setup, the CNs-Fe/KOH electrode shows a high specific capacitance of 253 F/g at 10 A/g, with a capacitance retention of 92...
September 18, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28920627/site-preferences-in-hetero-metallic-fe9-xnix-clusters-a-combined-crystallographic-spectroscopic-and-theoretical-analysis
#8
Anastasia N Georgopoulou, Karrar Al-Ameed, Athanassios K Boudalis, Dimitrios F Anagnostopoulos, Vassilis Psycharis, John E McGrady, Yiannis Sanakis, Catherine P Raptopoulou
The reaction of mixtures of Fe(O2CMe)2·2H2O and Ni(O2CMe)2·4H2O of various compositions with di-2-pyridyl ketone (py2CO, dpk) in MeCN under an inert atmosphere afforded a family of hetero-metallic enneanuclear clusters with general formula [Fe9-xNix(μ4-OH)2(O2CMe)8(py2CO2)4] (2, x = 1.00; 3: x = 6.02; 4, x = 7.46; 5, x = 7.81). Clusters 2-5 are isomorphous to the homo-metallic [Fe9] cluster (1) previously reported by some of us, and also isostructural to the known homo-metallic [Ni9] cluster. All four clusters contain a central M(II) ion in an unusual 8-coordinate site and eight peripheral M(II) ions in distorted octahedral environments...
September 18, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28920625/simultaneous-modulation-of-surface-composition-oxygen-vacancies-and-assembly-in-hierarchical-co3o4-mesoporous-nanostructures-for-lithium-storage-and-electrocatalytic-oxygen-evolution
#9
Hongyu Sun, Yanyan Zhao, Kristian Mølhave, Minwei Zhang, Jingdong Zhang
We developed a facile solution reductive method to simultaneously tune the surface composition, oxygen vacancies and three dimensional assembly in Co3O4 hierarchical nanostructures. The controllable surface composition, oxygen vacancies together with hierarchical micro/nanoarchitectures resulted in superior electrochemical properties when used as the anode materials for lithium-ion batteries and as an electrocatalyst for the oxygen evolution reaction. The excellent electrochemical performance is attributed to the synergistic effects of novel hierarchical morphology, crystal structure of the active materials, the improvement of intrinsic conductivity and inner surface area induced by the oxygen vacancies...
September 18, 2017: Nanoscale
https://www.readbyqxmd.com/read/28920440/unrestricted-mass-spectrometric-data-analysis-for-identification-localization-and-quantification-of-oxidative-protein-modifications
#10
Martin Rykær, Birte Svensson, Michael J Davies, Per Hägglund
Oxidation generates multiple diverse post-translational modifications resulting in changes in protein structure and function, associated with a wide range of diseases. Of these modifications, carbonylations have often been used as hallmarks of oxidative damage. However, accumulating evidence supports the hypothesis that other oxidation products may be quantitatively more important under physiological conditions. To address this issue we have developed a holistic mass spectrometry-based approach for simultaneous identification, localization and quantification of a broad range of oxidative modifications based on so-called 'dependent peptides'...
September 18, 2017: Journal of Proteome Research
https://www.readbyqxmd.com/read/28920438/conduction-mechanisms-at-interface-of-aln-sin-dielectric-stacks-with-algan-gan-heterostructures-for-normally-off-high-electron-mobility-transistors-correlating-device-behavior-with-nanoscale-interfaces-properties
#11
Giuseppe Greco, Patrick Fiorenza, Ferdinando Iucolano, Andrea Severino, Filippo Giannazzo, Fabrizio Roccaforte
In this work, the conduction mechanisms at the interface of AlN/SiN dielectric stacks with AlGaN/GaN heterostructures have been studied combining different macroscopic and nanoscale characterizations on bare materials and devices. The AlN/SiN stacks grown on the recessed region of AlGaN/GaN heterostructures have been used as gate dielectric of hybrid metal-insulator-semiconductor high electron mobility transistors (MISHEMTs), showing a normally-off behaviour (Vth=+1.2 V), high channel mobility (204 cm(2)V(-1)s(-1)), and very good switching behaviour (ION/IOFF current ratio of 5-6×10(8) and sub-threshold swing of 90 mV/dec)...
September 18, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28920412/molecular-cloning-purification-expression-and-characterization-of-%C3%AE-1-4-endoglucanase-gene-cel5a-from-eubacterium-cellulosolvens-sp-isolated-from-holstein-steer-s-rumen
#12
Tansol Park, Seongwon Seo, Teaksoon Shin, Byung-Wook Cho, Seongkeun Cho, Byeongwoo Kim, Jong K Ha, Jakyeom Seo
Objective: This study was conducted to isolate the cellulolytic microorganism from a rumen of Holstein steer and characterize endoglucanase gene (Cel5A) from the isolated microorganism. Methods: To isolate anaerobic microbes having endoglucanase, the rumen fluid was obtained from Holstein steers fed roughage diet. The isolated anaerobic bacteria had 99% similarity with Eubacterium cellulosolvens Ce2 (Accession number: AY178842.1). The Cel5A from isolated E. cellulosolvens sp...
September 18, 2017: Asian-Australasian Journal of Animal Sciences
https://www.readbyqxmd.com/read/28920151/removal-of-arsenic-iii-and-v-from-laboratory-solutions-and-contaminated-groundwater-by-metallurgical-slag-through-anion-induced-precipitation
#13
Rafael Schouwenaars, Claudia Victoria Montoya-Bautista, Elizabeth Diane Isaacs-Páez, Myriam Solís-López, Rosa María Ramírez-Zamora
Metallurgical slag was used for the simultaneous removal of high concentrations of arsenite and arsenate from laboratory solutions and severely contaminated groundwater. Apart from demonstrating the high efficiency of arsenic removal in presence of competing species, the work aims to explore the physicochemical mechanisms of the process by means of microscopy observation and a detailed statistical analysis of existing kinetic and isotherm equations. Fitting was performed by non-linear least squares using weighted residuals; ANOVA and bootstrap methods were used to compare the models...
September 17, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28919532/performance-of-cellulose-acetate-ferric-oxide-nanocomposite-supported-metal-catalysts-toward-the-reduction-of-environmental-pollutants
#14
Esraa M Bakhsh, Shahid Ali Khan, Hadi M Marwani, Ekram Y Danish, Abdullah M Asiri, Sher Bahadar Khan
Water contamination by toxic compounds has become one of the most serious problems worldwide. Catalytic reduction using metal nanoparticles offer opportunities for environmental benefits. In this study, cellulose acetate-ferric oxide nanocomposite (CA/Fe2O3) was prepared and used as support for metal nanoparticles. After adsorption of Ag, Cu or Ni ions from aqueous solutions, metal ions associated with CA/Fe2O3 were treated with sodium borohydride to prepare Ag, Cu and Ni nanoparticles loaded CA/Fe2O3. The CA/Fe2O3 supported Ag, Cu or Ni nanoparticles was evaluated as a catalyst for pollutants degradation...
September 14, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28919512/strontium-and-magnesium-ions-released-from-bioactive-titanium-metal-promote-early-bone-bonding-in-a-rabbit-implant-model
#15
Yaichiro Okuzu, Shunsuke Fujibayashi, Seiji Yamaguchi, Koji Yamamoto, Takayoshi Shimizu, Takashi Sono, Koji Goto, Bungo Otsuki, Tomiharu Matsushita, Tadashi Kokubo, Shuichi Matsuda
We have previously developed the "alkali and heat treatment" method to confer bioactivity (bone-bonding ability) to titanium metal (Ti). As strontium (Sr) and magnesium (Mg) ions reportedly promote osteoblastic cell proliferation and differentiation and accelerate bone formation, we improved this method to induce the release of Sr (Sr-Ti) or Mg (Mg-Ti) ions from Ti in a previous study. Here, we evaluated the bioactivity of these novel surface treatments, Sr-Ti and Mg-Ti. In vitro evaluation of cell viability, expression of integrin β1, β catenin, and cyclin D1, osteogenic gene expression, alkaline phosphatase activity, and extracellular mineralization using MC3T3-E1 cells revealed that Sr-Ti and Mg-Ti enhanced proliferation and osteogenic differentiation...
September 14, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28919419/binding-mode-of-metal-ions-to-the-bacterial-iron-import-protein-efeo
#16
Kanate Temtrirath, Kenji Okumura, Yukie Maruyama, Bunzo Mikami, Kousaku Murata, Wataru Hashimoto
The tripartite EfeUOB system functions as a low pH iron importer in Gram-negative bacteria. In the alginate-assimilating bacterium Sphingomonas sp. strain A1, an additional EfeO-like protein (Algp7) is encoded downstream of the efeUOB operon. Here we show the metal binding mode of Algp7, which carries a M_75 metallopeptidase motif. The Algp7 protein was purified from recombinant E. coli cells and was subsequently characterized using differential scanning fluorimetry, fluorescence spectrometry, atomic absorption spectroscopy, and X-ray crystallography...
September 14, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28919350/crystal-structure-of-inositol-1-3-4-5-6-pentakisphosphate-2-kinase-from-cryptococcus-neoformans
#17
Juntaek Oh, Dong-Gi Lee, Yong-Sun Bahn, Sangkee Rhee
The fungal pathogen Cryptococcus neoformans is a causative agent of meningoencephalitis in humans. For its pathogenicity, the inositol polyphosphate biosynthetic pathway plays critical roles. Recently, Ipk1 from C. neoformans (CnIpk1) was identified as an inositol 1,3,4,5,6-pentakisphosphate 2-kinase that catalyzes the phosphorylation of IP5 to form IP6, a substrate for subsequent reaction to produce inositol pyrophosphates, such as PP-IP5/IP7. Furthermore, it was shown that deletion of IPK1 significantly reduces the virulence of C...
September 15, 2017: Journal of Structural Biology
https://www.readbyqxmd.com/read/28918628/breaking-benzene-aromaticity-computational-insights-into-the-mechanism-of-the-tungsten-containing-benzoyl-coa-reductase
#18
Martin Culka, Simona G Huwiler, Matthias Boll, G Matthias Ullmann
Aromatic compounds are environmental pollutants with toxic and carcinogenic properties. Despite the stability of aromatic rings, bacteria are able to degrade the aromatic compounds into simple metabolites and use them as growth substrates under oxic or even under anoxic conditions. In anaerobic microorganisms, most monocyclic aromatic growth substrates are converted to the central intermediate benzoyl-coenzyme A, which is enzymatically reduced to cyclohexa-1,5-dienoyl-CoA. The strcitly anaerobic bacterium \textit{Geobacter metallireducens} uses the class II benzoyl-CoA reductase complex for this reaction...
September 18, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28918624/synthesis-of-oligodiacetylene-derivatives-from-flexible-porous-coordination-frameworks
#19
Yu-Ichi Fujiwara, Kentaro Kadota, Sanjog S Nagarkar, Prof Norio Tobori, Susumu Kitagawa, Satoshi Horike
Oligodiacetylenes (ODAs) with alternating ene-yne conjugated structure is one of the significant materials for optical and electronic properties. Due to the low solubility of ODAs in common solvents, the synthetic approaches are limited. Here we disclose a new synthetic approach of ODAs without side alkyl chain using porous coordination polymer (PCP) as a sacrificial template. 1,2-bis(4-pyridyl)butadiyne which work as a monomer were embedded in the flexible frame-work of PCP, and ODAs were synthesized via utilization of the anisotropic thermal expansion (ATE) of PCP crystal...
September 16, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28918291/distinguished-cr-vi-capture-with-rapid-and-superior-capability-using-polydopamine-microsphere-behavior-and-mechanism
#20
Qingrui Zhang, Yixuan Li, Qinggang Yang, He Chen, Xinqing Chen, Tifeng Jiao, Qiuming Peng
Toxic heavy metal containing Cr(VI) species is a serious threat for ecological environment and human beings. In this work, a new mussel-inspired polydopamine microsphere (PDA-sphere) is prepared through in situ oxidative polymerization at air condition with controllable sizes. The adsorption of Cr(VI) ions onto PDA-sphere is highly pH dependent with the optimal pH ranging from 2.5 to 3.8. A rapid Cr(VI) removal can approach in 8min for equilibrium. More importantly, the prepared materials exhibit a remarkable sorption selectivity, coexisting SO4(2-), NO3(-) and Cl(-) ions at high levels; The applicability model further proves its effective performances with treated capacity of 42,000kg/kg sorbent, and the effluent can be reduced from 2000ppb to below 50ppb, which meets the drinking water criterions recommended by WHO...
August 26, 2017: Journal of Hazardous Materials
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